[单项选择]In the Arizona desert, tomatoes hang from ceilings, spinach grows without soil and shrimp lire in indoor pools. What’s going on.’ Food research!
People perform these experiments to learn how to produce more food. There will be over 6.5 bil- lion people on earth after two decades. We will have to produce four times as much food as we do now to feed all these people. But each year there is less fresh water, the soil loses nutrients and buildings take up more land. We must learn to use resources we have always thought unusable. So, the Environ- mental Research Laboratory in Arizona tries to grow food without soil, in the desert, and with salt water.
So far the results have been excellent. The new methods yield twenty times more tomatoes and cu-cumbers than can be grown on a farm. About sixty times as many shrimp can be raised in indoors pools than ten boats can catch in the ocean in a year. Crops can grow in salty soil. Plus, as they grow, they take salt and minerals from desert
A. new ways to grow spinach
B. the population explosion
C. research to produce more food
D. desert farming

[单项选择]In the Arizona desert, tomatoes hang from ceilings, spinach grows without soil and shrimp lire in indoor pools. What’s going on.’ Food research!
People perform these experiments to learn how to produce more food. There will be over 6.5 bil- lion people on earth after two decades. We will have to produce four times as much food as we do now to feed all these people. But each year there is less fresh water, the soil loses nutrients and buildings take up more land. We must learn to use resources we have always thought unusable. So, the Environ- mental Research Laboratory in Arizona tries to grow food without soil, in the desert, and with salt water.
So far the results have been excellent. The new methods yield twenty times more tomatoes and cu-cumbers than can be grown on a farm. About sixty times as many shrimp can be raised in indoors pools than ten boats can catch in the ocean in a year. Crops can grow in salty soil. Plus, as they grow, they take salt and minerals from desert
A. people get hungrier every year
B. the population of the world is growing
C. there are too many unemployed farmers
D. people do not like the food now produced

[填空题]Arizona produces more organic fruits and vegetables than Florida.

[单项选择]Latino youths need better education for Arizona to take full advantage of the possibilities their exploding population offers. Arizona’s fast-growing Latino population offers the state tremendous promise and a challenge. Even more than the aging of the baby boomers, the Latino boom is fundamentally reorienting the state’s economic and social structure.
Immigration and natural increase have added 600,000 young Latino residents to the state’s population in the past decade. Half of the population younger than 18 in both Phoenix and Tucson is now Latino. Within 20 years, Latinos will make up half of the homegrown entry-level labor pool in the state’s two largest labor markets.
What is more, Hispanics are becoming key economic players. Most people don’t notice it, but Latinos born in Arizona make up much of their immigrant parents’ economic and educational deficits. For example, Second-generation Mexican-Americans secure an average of 12 grades of schooling where their p
A. aging problem
B. educational system
C. economic structure
D. financial deficits

[单项选择]Large animals that inhabit the desert have evolved a number of adaptations for reducing the effects of extreme heat. (31) adaptation is to be light in color, and to (32) rather than absorb the sun’s rays. Desert mammals also depart from the normal mammalian practice of maintaining a (33) body temperature. (34) trying to keep down the body temperature deep inside the body, (35) would involve the expenditure of water and energy, desert mammals allow their temperatures to rise to what would normally be fever (36) , and temperatures as high as 46 degrees Celsius have been measured in gazelles (瞪羚羊).
Another strategy (37) large desert animals is to tolerate the loss of body water to a point (38) would be fatal for non-adapted animals. The camel can lose up to 30 percent of its body weight (39) water without harm to itseff, (40) human beings die after losing only 12 to 13 percent oftheir body weight.
A. react
B. reflect
C. reduce
D. repel